4. Martial arts

Calories burned per hour: 700 to 1,100

Regardless of whether you’re practicing karate, judo, tae kwon do or any other martial art, you can’t go wrong. Any activity that has you moving quickly and in a variety of ways is sure to help tone you up, whether you’re learning a new martial art or you’re an experienced combatant. Remember, you don’t have to learn this skill with the intention of fighting or grappling. Gyms are full of people learning combat sports without the intention of stepping into the ring.